staging: rtl8712: r8712_os_recvbuf_resource_free(): Change return type

Change return type of r8712_os_recvbuf_resource_free from int to void as
it always returns _SUCCESS and this return value is never stored,
checked or otherwise used. Remove return statement accordingly.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190802064212.30476-5-nishkadg.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>